Transmission of power



Patented May 14, 1940 UNITED STATE-S TRANSMISSION OF POWER Arnold H.Beede, Fairfield, Conm, assignor to Dictaphone Corporation, New York, N.Y., a corporation of New. York Application April 6, 1938, Serial No.200,335

3 Claims.

This invention relates to apparatus for transmission of power from acontinuously operating source of power to mechanism which in ordinaryuse operates intermittently at the will of the op- 5 erator, and moreparticularly is designed to start and stop rotation of the recordsupport of a phonograph.

An object of the invention is to provide a simple and eflicient deviceof the character described which will be positive in action, of ruggedconstruction and compact in form. Other objects will be in part obviousand in part pointed out hereinafter.

The invention accordingly consists in the features of construction,combinations of elements,

' and arrangements of parts as will be exemplified in the structure tobe hereinafter described and the scope of the. application of which willbe indicated in the following claims.

In the accompanying drawing, in which is shown one of the variouspossible embodiments of the invention I Fig. i is an end view of aphonograph and its driving motor, including a preferred form of startand stop mechanism embodying the present invention; and l 1 Fig. 2 is amore or less diagrammatic plan view of the said mechanism with wiringdiagram showing its electrical control features.

In Fig. l there'is indicated by the numeral it a phonograph of knowntype having mounted upon its mandrel or record support shaft ll a fixedpulley it. This pulley is connected by a drive belt it with a pulley itmounted upon the shaft it of the phonograph drive motor it. The pulleyit serves as the shifting member of a clutch forming part of thetransmission mechanism which is the subject matter of the presentinvention.

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the motor shaft l5 and is shiftable along said shaft in one directioninto driving engagement with a clutch disc llrigidly mounted at the endof the shaft and is also shiitable in the opposite iii disc it rigidlymounted upon the motor frame. Pulley it is provided at each end withmeans such as the teeth id and til adapted to cooperate with similarteeth iii and 22 carried respectivelyby the discs it and it.

For shifting the clutch pulley there is provided a lever 23 pivotallymounted as at 2% in lugs extending outwardly from the motor frame. Oneend of this lever is formed as a yoke 25' and an carries a pair ofoppositely disposed pins 25 which The clutch pulley it is rotatablymounted 021' direction into locked engagement with a similarfit freelyin a circumferential groove 26 formed on the clutch pulley ll adjacentthe endthereof. The other end of lever 23 is apertured loosely toembrace the extended stem 21 of a soft iron solenoid core 28, which isslidable from end to end of a non-magnetic core tube 29. It will beunderstood that the shifting of the core from one end of its stroke tothe other will shift the clutch pulley into engagement with the disc ITor with the disc l8 as the case may be. The end of lever 23 is heldbetween nuts 30 and 3| threaded upon the end of the stem 2] wherebysuitable adjustment may be made in order to establish correctrelationship between the pulley and the solenoid core. The solenoid 32comprises two separate coils 3 3 and 34 disposed end to end in coaxialrelation with the core tube 29, said coils being surrounded by anysuitable casing 35.

- The solenoid is mounted as a unit upon the motor frame with the stem21 parallel in respect to the motor shaft l5 and is secured to the motorframe byone or more bands or straps 36 fastened by means of screws 31 tothe said frame. spring detent member 38 secured to the end of thesolenoid casing by a screw 3a is adapted resiliently to engage either ofthe two dwells 39, t0 provided at spaced points along the solenoid corestem 21, the spacing being such that the core with its connections tothepulley It will be lightly held in either of its extreme positions.

The current alternately exciting the coils 3t and 34 may be taken fromany suitable source over the wires 0: and b. The wire a is connected tothe movable contact finger M of a single pole .double throw *switchcomprising the finger M and two fixed contacts t2 and $3. This switch isof the snap type and is actuated by means of a toggle spring ddconnected at one end to the movable finger ti and at the other to thesolenoid core stem 27, the construction being such that as the stemmoves from one end position to the otherythe switch contact ti issnapped from engagement with one of the fixed contacts into engagernentwith the other thereof immediately after'the spring at swings across thecenter line of the finger.

The wire 12 connects with a movable contact d5 of a single pole doublethrow switch operated manually by means of a push button M, or the like.This switch also includes a pair of fixed contacts t'l and at. Themovable contact th is normally biased to engage the contact t7 and ismoved into contact with th by pressing the button 46. When released,contact re-engages contact 4?. This switch may be suitably mounttillbutton 46.

ed in any location convenient for manual operation of the phonograph.

The coil 33,0f the solenoid is connected in a line running from contact4'! of the button tions in respect to the disclosure oi Fig. 2, the

hand controlled button 46 is pressed closing the circuit through coil34. Energizing this coil causes the core 28 to be drawn to the righttothe position shown in Fig. 2, simultaneously shifting the clutch pulleyinto engagement with the driving disc I! on the motor shaft. Thisengagement immediately starts operation of the phonograph .practicallyat full speed. During this movement of the solenoid core the switchcontact 4l is snapped from engagement with 42 onto 43 thus preparing forthe excitation -of coil 33 as soon as the operator, desiring to stop themachine, releases the button 46. When this-happens the core is shiftedto its initial position moving the clutch pulley into engagement withthe stop plate l8 thus effecting instant cessation of machine operation,and simultaneously again shifting contact finger 4| into engagement withcontact 42 preparing the parts for renewed operation when pressure isagain applied to thestarting It will be noted that since the current iscut off from whichever coil is activating the solenoid core, before thecore reaches the end of its throw in either direction, some means isnecessary to hold the clutch in either of its end positions. This meansmentioned above is the spring detent 38. This spring engages'the dwellson the shaft 21 with just suflicient pressure to hold the clutch memberin operative relation either to the disc I! or the disc I8 whilepermitting the core to shift without much resistance when the operationof the solenoid is reversed.

It will be seen, therefore, that this inventionprovides a start and stopmechanism which is quick and positive in action, consumes relativelylittle electric current and generally attains the objects hereinbeforeset forth.

I claim: 1. In a commercial phonograph, the combination of a movablemember for operating said phonograph adapted to occupy an operative orinoperative position, a pair of solenoid coils, a

circuit system for alternately energizing said coils, a reciprocatoryarmature member common to said pair of coils, mechanism connected tosaid armature member for controlling the movement of said movable memberto and from said circuit of the inactive coil for energizationwhenclosed by said control device, whereby the active coil is notdeenergized and the inactive cell cannot be energized until saidarmature member'ls urged further in the direction of its initialmovement by the snap action of said switch.

2. In a commercial phonograph, the combination of a movable member foroperating said phonograph adapted to occupy an operative or inoperativeposition, a pair of electromagnets, a. circuit systein for alternatelyenergizing said magnets, an armature member oppositely afiected by saidpair of magnets, mechanism connected to said armature member forcontrolling the movement of said movable member to and from saidpositions, a control device in said circuit for closing the circuit toone magnet to move said movable member to its inoperative position andfor closing the circuit to said other magnet to-elIect movement of saidmovable member to its opera.- tive position, switch means in saidcircuit, and resilient means associated with said armature member andsaid switch means for efiecting the operation of said switch means inresponse to movement of said armature member only when the latter hasmoved beyond mid-position in either direction to open the circuit to theactive magnet and to prepare the circuit of the inactive magnet forenergization when closed by said control device, whereby the activemagnet is not deenergized and the inactive magnet cannot be energizeduntil said armature member is urged beyond the mid-point of its travelin the direction of its initial movement by the action of said resilientmeans.

3. In a commercial phonograph, the combinainoperative position, a pairof eiectromagnets, a circuit system for alternately energizing saidmagnets, an armature member oppositely affected by said pair of magnets,mechanism connected to said armature memberfor controlling the movementof said movable member to and from said positions, a controldevice insaid circuit normally biased to close the circuit to one magnet normallyto maintain said movable member in -tion of a movable member foroperating said phonograph adapted to occupy an operative or itsinoperative position and to open the circuit to the other magnet, saidcontrol device being manually operable in opposition to said bias toopen the circuit to said first magnet and close the circuit to saidother magnet to efiect movement of said movable member to its operativeposition,

switch means in said circuit, and resilient means associated with saidarmature member and said switch means for effecting the operation ofsaid switch means in response to movement of said armature member onlywhen the latter has moved beyond mid-position in either direction toopen the circuit to the active magnet and to prepare the circuit of theinactive magnet for energization when closed by said control device,whereby the active magnet is not deenergized and the inactive magnetcannot be energized until said armaiture member is urged beyond themid-point of its travel in the direction of its initial movement by theaction ,of said resilient means.

'ARNOLD H. BEEDE.

